Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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A student was assigned the task of determining the molar mass of an unknown gas. The student measured the mass of a sealed 843 mL rigid flask that contained dry air. The student then flushed the flask with the unknown gas, resealed it, and measured the mass again. Both the air and the unknown gas were at 23.0°C and 750. torr. The data for the experiment are shown in the table below.
Volume of sealed flask 843 mL
Mass of sealed flask and dry air 157.70 g
Mass of sealed flask and unknown gas 157.40 g
Calculate the mass, in grams, of the dry air that was in the sealed flask. (The density of dry air is 1.18 g L−1 at 23.0°C and 750. torr.)
g air
Calculate the moles of air that were in the sealed flask.
moles air
Calculate the mass, in grams, of the sealed flask itself (i.e., if it had no air in it).
g
Calculate the mass, in grams, of the unknown gas that was added to the sealed flask.
g unknown gas
Using the information above, calculate the value of the molar mass of the unknown gas.
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